feat(performance): add concurrent user load tests for each product

[Copilot]

Issue #117 requested load tests focused on concurrent users (not large sessions). The existing test_concurrency scenarios only hit anonymous health-check endpoints — these new tests simulate authenticated users making real API calls simultaneously.

New: test_load scenarios

Three Scenario Outline definitions under src/vip_tests/performance/, one per product, each running at 10, 20, 50, and 100 concurrent users (12 test cases total):

Product	Endpoint	Auth
Connect	GET /__api__/v1/content	API key
Workbench	GET /api/server/settings	API key
Package Manager	GET /__api__/repos	******

Each scenario asserts:

• Success rate ≥ 95%
• p95 response time ≤ performance.p95_response_time

The user count is passed directly from the Examples table into each When step, so test IDs are clearly labeled (e.g. test_connect_handles_users_concurrent_authenticated_users[100]).

Auto-skips per product when not configured, consistent with the rest of the performance suite.

Original prompt

work on the load tests issue. design a plan and ask me questions to refine it.

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[statik]

@copilot run these for 10, 20, 50, 100 ussrs

[Copilot]

@copilot run these for 10, 20, 50, 100 ussrs

Done in a9bae63. Converted each scenario to a Scenario Outline with an Examples table containing 10, 20, 50, and 100 — giving 12 test cases total (4 user counts × 3 products). The user count is now passed directly into each When step via parsers.parse, so the test IDs are clearly labeled (e.g. test_connect_handles_users_concurrent_authenticated_users[100]). The load_users config field was removed since the levels are now fixed in the feature file.

[github-actions]

Preview Links

Website	Validation Report
https://posit-dev.github.io/vip/pr-preview-site/pr-118/	https://posit-dev.github.io/vip/pr-preview/pr-118/